Church blogging
This doesn't fit into "corporate" blogging, of course, but it is all about how an organization can use blogs: 4 Ways Blogging Can Change Your Church (via).
"...a preacher will be able to post a sermon idea at the beginning of the week and have the congregation respond so that when he delivers the sermon he will have brought many along for the ride" the author writes.
Living in one of the most secular societies in the world I don't know for sure, but it sounds like a groundbreaking idea to me. And still, it seems perfectly natural.